2051311578 has 32 divisors (see below), whose sum is σ = 4248028800. Its totient is φ = 659580096.

The previous prime is 2051311547. The next prime is 2051311627. The reversal of 2051311578 is 8751131502.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 206203 + ... + 215921.

It is an arithmetic number, because the mean of its divisors is an integer number (132750900).

Almost surely, 2^2051311578 is an apocalyptic number.

2051311578 is an abundant number, since it is smaller than the sum of its proper divisors (2196717222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2051311578 is a wasteful number, since it uses less digits than its factorization.

2051311578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10966.

The product of its (nonzero) digits is 8400, while the sum is 33.

The square root of 2051311578 is about 45291.4073307509. The cubic root of 2051311578 is about 1270.6049524547.

The spelling of 2051311578 in words is "two billion, fifty-one million, three hundred eleven thousand, five hundred seventy-eight".